电子计算机的发展水平是衡量当今社会现代化的重要标志之一。随着电子计算机在我国国民经济各方面的日益广泛的应用,对于输出印字设备的要求也愈来愈高。这些要求不外乎是高速度、多功能、低噪声、字迹清晰、价格便宜、维护方便等。围绕这些要 The level of development of computer is one of the most important symbols to measure the social modernization. With the increasingly widespread application of electronic computers in all aspects of our national economy, the demand for output printing equipment is also getting higher and higher. These requirements are nothing more than high speed, multi-function, low noise, clear handwriting, cheap price, easy maintenance and so on. Around these needs